Brassy Mining Bee - Lasioglossum morio

Alternative names
Common Green Furrow Bee

This is the commonest of the four Lasioglossum species with metallic colouration. Both sexes are most easily distinguished from the others by the densely punctate, dull scutum which has microsculpture between the punctures. Some females of Lasioglossum leucopus can be difficult to separate, but morio has a duller thorax, duller hind margins to the upper part of the propodeum, and minute transverse ridges on the apical depression of tergite 2.

Similar Species

L. leucopus also has dense and even-sized punctures on the scutum but lacks the ridges on tergites 2 and 3.

L. smeathmanellum and L. cupromicans both have a scutum with sparce punctures of variable size.

L. smeathmanellum has a propodeum that is dull and rugose whereas in L. cupromicans it is smooth and shining.

Identification difficulty
ID guidance
  • small - wing length max 5mm
  • green, metallic head thorax and abdomen
  • scutum with dense and evenly-sized punctures and microsculpture between them
  • apical depression of tergites 2 and 3 with minute transverse ridges
Recording advice

Unless identified by a recognised expert, a photo is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used and describe the size and identifying characters.


Found in a wide range of habitats, where it exploits various flowers.

When to see it

Females are active from late March to the end of October, males from late June to late October (exceptionally early November).

Life History

It can sometimes be found nesting in the soft mortar walls or in exposed soil.

UK Status

This is a widespread and often abundant species in England and Wales, and the commonest of our four small, metallic-green/bronzy Lasioglossum species.

VC55 Status

Fairly common in Leicestershire and Rutland.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map